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單項(xiàng)選擇題

Which of the following is not correct? （）

A.It is useless to complain.
B.It is useless complaining.
C.Complaining is useless.
D.It is useless of complaining.

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He seemed to be unaware（）the trouble he was causing.

A.for
B.on
C.of
D.about

單項(xiàng)選擇題

I can't see（）between these two books

A.a many difference
B.much difference
C.many difference
D.much a difference